Polls show the Ohio governor is neck and neck with GOP frontrunner Donald Trump in the Republican presidential primary. Kasich has cast this primary as a referendum on Trump's rude brand of politics. But can he pull it off?

Hillary Clinton leads polls in the Democratic Ohio primary, but Bernie Sanders sits just a few points behind. Will the Vermont senator see an upset in the Buckeye State?

Voters in Florida, Illinois, Missouri and North Carolina also cast ballots in both presidential primaries today. The Northern Marinas Islands will weigh in on the GOP race in a caucus.

O'Malley was handily defeating McGinty with about 89 percent of the vote tallied in the Democratic primary.

That's it for us tonight. Check back for more updates and analysis.

11:40 a.m.

Hillary Clinton and John Kasich weren't competing against each other on Tuesday in Ohio, but Kasich ended up winning support from more Ohio voters, according to Data Analysis Editor Rich Exner. Read more here, and check out the map below.

11:10 a.m.

Before John Kasich and Hillary Clinton clinched Ohio primary victories Tuesday, cleveland.com talked to more than two dozen Ohio voters to learn about who they supported and why.

We followed up with some of those voters to get their election-night reactions.

Janice Cohen, 46, of Westlake

"I'm not really surprised Hillary won the election here in Ohio at all. Why? Because of all her experience. People feel safe with a name they know." Read more here.

Stacie Gregory, 51, Geneva:

I think this is bull crap.

I don't know a single person that voted for Kasich. Even everyone at my polling place said that they were on the Trump train. How Kasich won Ohio is beyond me.

"The Ohio governor won his home state's Republican presidential primary Tuesday, claiming all 66 delegates up for grabs. Kasich now has a chance to block real estate mogul Donald Trump, the front-runner who has many party leaders in a panic over the prospect of his nomination.

"Thank you, Ohio Democrats," Strickland said in prepared remarks to supporters in Columbus. "I am honored to have earned your vote, your trust and your nomination. I am running to fight for Ohio's working people because that's where I came from, that's who I care about and that's who I will stand up for in the U.S. Senate."

John Kasich addressed an exuberant crowd in Berea. He saw at least one protester, who appeared to wear a hat that read "Make America Great Again," Donald Trump's slogan. Read more from Reporter Emily Bamforth here.

"I have to thank the people of the great state of Ohio, I love ya," emotional John Kasich tells supporters https://t.co/rckjmxzCYC

Ohio Gov. John Kasich swept to victory in Tuesday's Republican Party primary with strong support across most of the state, early vote returns showed, Data Analysis Editor Rich Exner writes. See how the the numbers break down here.

Votes reported shortly before 9 p.m. showed Kasich leading in 61 counties and Donald Trump in 26 counties. There were no results released yet by the Secretary State for Portage County.

Brent Larkin was The Plain Dealer's editorial director from 1991 until his retirement in 2009. Read his takeaway on John Kasich's victory here. Or check out a snippet below.

John Kasich beat the bully.

Beat him pretty badly...Kasich took down the candidate whose hateful campaign for the presidency condones, maybe even encourages, violence. Kasich's win allows him to continue. It will bring him new friends and perhaps help raise a lot of money. Now he has to win somewhere else.

So far, Kasich has won convincingly in the one place where he has sky-high approval ratings and, to hear him tell it, a record of jaw-dropping accomplishments. And he's lost in the 28 other states where he doesn't.

9:04 p.m.

Check out this video of John Kasich speaking to CNN, after his GOP Ohio primary victory.

Kasich has said he would bow out if he didn't win Ohio. Winning the state and its 66 delegates means Kasich can fight on as a possible alternative to the bombastic Trump, who has alienated much of the Republican Party establishment Reporter Peter Krouse writes.

GOP frontrunner Donald Trump began taking Kasich more seriously as the Ohio primary neared. He stepped up attacks on Kasich this past weekend, calling him an absentee governor. He has also criticized Kasich for supporting the North American Free Trade Agreement.

Hillary Clinton and John Kasich are leading in early vote returns on the strength of big leads in Ohio's largest metro areas of Cleveland, Columbus and Cincinnati, Data Analysis Editor writes. Read more here, and check out the early results below.

Clinton has earned 37,036 in Cuyahoga County so far, according to the Ohio Secretary of State. Sanders has garnered 13,233.

Kasich has won 14,591 in Cuyahoga County so far. Donald Trump has earned 9,092.

8:30 p.m.

All Ohio polls are now closed. A car crash forced polls in four counties -- Butler, Clermont, Hamilton and Warren --- to stay open until 8:30 p.m, according to Reporter Jackie Borchardt.

8:26 p.m.

Hillary Clinton wins the North Carolina Democratic primary, her second victory of the night.

Florida Senator Marco Rubio ends presidential campaign while speaking to supporters in the Sunshine State. Rubio lost his home state to Donald Trump.

"But after tonight, it is clear that while we are the right side, this year, we will not be on the winning side," Rubio said.

8:20 p.m.

Timothy J. McGinty has a slight lead among absentee voters in Cuyahoga County's Democratic primary race for county prosecutor over Parma Safety Director Michael O'Malley, according to Reporter Cory Shaffer.

McGinty, the incumbent, captured 52.2 percent of more than 42,000 absentee ballots cast in the Democratic primary, according to the Cuyahoga County Board of Elections.

8:15 p.m.

The Democratic race for U.S. Senate in Ohio is taking shape. With relatively few ballots counted, former Ohio Gov. Ted Strickland is enjoying an early and substantial lead in the Democratic primary for U.S. Senate, according to Washington Bureau Chief Stephen Koff.

With 77 percent of precincts reporting, Trump was winning Florida's Republican primary with 45 percent of the vote, with Sen. Marco Rubio trailing with about 28 percent, Sen. Ted Cruz with 16 percent and Ohio Gov. John Kasich with 7 percent, according to CNN.

8 p.m.

Most Ohio polls are closed. Here are the latest results for Ohio presidential primary races as reported by county boards of election to the Ohio secretary of state. Read more here for statewide races and Northeast Ohio congressional districts.

Democratic presidential primary

Hillary Clinton 98,110 votes

Bernie Sanders 42,720 votes

Republican presidential primary

John Kasich 67,184 votes

Donald Trump 47,220 votes

Ted Cruz 20,242 votes

Marco Rubio 10,379 votes

The Republicans will award all their delegates to the statewide winner. The Democrats will not.

7:55 p.m.

CNN reports Donald Trump leads Ohio primary with less than one percent of the precincts reporting. Trump is at 45.2 percent, John Kasich at 34.5, Ted Cruz at 11.6 percent and Rubio at 6.1 percent.

The winner-take-all primary has 66 delegates at stake.

7:45 p.m.

Which Ohio counties are important on election day?

"Ohio has a lot of small counties among the 88 counties statewide. Important to watch are the results from nine counties that account for half the voters. They are Butler, Cuyahoga, Franklin, Hamilton, Lorain, Lucas, Montgomery, Stark and Summit," according to Data Analysis Editor Rich Exner.